Semi-automatic telephone system



G. A. YANOCHOWSKI AND H. E.' HERSHEY. SEMI-AUTOMATIC TELEPHONE. SYSTEM.

APPLICATION FILED luLvz's. 1917. RENEWED mu. 2h. ago.

1 353,300, A Patented Sept. 21, 1920 2 SHEETS-SHEET lurge i 1 Ynuchuuush Hal-"1 7 7 E Hershey G. A. YANOCHOWSKI AND H. E. HERSHEY. SEMI-AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED JULY 25, I917. RENEWED JAN. 28. 1920.

1 53,300, PatentedSept. 21, 1920.

2 SHEETS-SHEET 2.

fz'zuenfur' Sam-gs H Y'nuc' c/wskL Harry E Hershey H270? may m III-NIH!" I .Be it known that we,

barren s'ra'rss GEORGE A. YANOCHOWSKI, or CHICAGO, ILLIno s, AND HARRY E. HERSHEY on WHITEWATER, KANsA's; assie'noas To anro'rlrario-ntnornro ooMfPANY, or r CHICAGO, ILLINoI's, A oonrona'rion or ILLINOIS;

SEMI-AUTOMATICTELEPHONE SYSTEM;

Specification of Letters Patent.

' ra'ee tease aei 1920.

Original application filed November 25, 1914, Serialjl'o. 874,054. Patent No. 1,317,190. Divided and this application m d July 25, 1917, Serial No. 182663. Renewe-:1 January 28, 1920. Serial No. 355,584f

T 0 all whom it may concern.

Gnonen A. YANO- cnowsnr and HARRY E. HERSHEY, both citizone of the United States of America, and residents of Chicago, Cook county, Illinois, andl/Vhitewater, Butler county, Kansas, respectively, lnve invented certain new and useful Improvements in Semi-Automatic Telephone Systems, of which the following is a specification. Y r Our inventlon relates to telephone systems and is particularly applicable to manual telephone systems. Among the objects of our invention are the following:

To provide means whereby when a subscriber removes his receiver he immediately supplies a guarding potential to the multiple jacks of his line; to provide means for automatically giving a calling subscriber a signal as soon as the operator disconnects from his line to indicate to him that he should hang up his receiver; to provide means whereby a B operator can automatically give an A operator a disconnect signal by merely dropping the calling plug; to provide means for automatically giving one operator a disconnect signal from another 'operators position by autom'ati'c'allyv varying the resistance of the talking circuit between the two cords; and to provide other details and features of improvement and combination tending to increase the efliciency and serriceability of a telephone system. Means for accomplishing the foregoing and other useful ends are hereinafter set forth and claimed. r i

This application isa division of our application'Serial No. 874,054, filed November 25, 1914, Patent No. 1,317,190, issued Sept. 30, 1919. The features of our invention that we desire to patent in this division are those capable of separate and independent -use either with single exchangev apparatus or with different types of divided exchange apparatus. V V

In the accompanying drawings Figures 1 and 2 show a complete, connection in a. manual telephone system embodying the principles of our invention. I Fig. 1 shows the manual substation T,an

answering equipment fl, multiple aclrs M and an A operators cord circuit A and. condenser 5.

-. lays for controlling thesame.

Fig. 2 shows a manual-substation;T, an answering ack equipment J, multiplejacks M and a; B-operators cord circuit 1. I The manual substation T is an ordinary common battery manual telephone compris- 7 ing the usual receiver 2, transmitter 3, ringer The substation T is similar to the substation Ti The answering jack equipment J consists of the usual line relay 6, cut-oil relay 7, line lamps 8 and an answering-jack 9. And'in add tion there is provided the slow acting relay 10. The answering. jack equipment J is similar to that shown at "J except that the relays 6 and 10 arereplaced by the one double wound relay 11 The relay 'll is so constructed and adjusted that when a cir- P, respectively, inductively connected together through the medium ofla repeating coil R. The usual supervisoryrelays 11 and 12 are included in the sides of the cord circuit for controlling the supervisory lamps 13' and 14. i

. The'B-operators cord circuit I comprises,

the plug P the supervisory lamp 15 and re At 16 is shown a plugseat switch whose springs vare separated when the plug P is in its seat.

F or the purpose of supplying battery current for operating the apparatus and for ,talking purposes, there is shown the battey B, having one terminal grounded at The busy signaling machines Q/and QF, as

represented herein, comprise an induction coil or transformenthe primary winding of which is included in a local circuit with a battery and aninterrupter. medium of this interrupter an lnterrupted current is supplied to the primary winding,-

which induces an alternating current in the secondary winding, whereby. when said.

winding isconnected with the subscribers line, a. buzzlng sound s heard ln-the receiver. r I y A general description of the apparatus having been given, it will now be explained Through the how connection can be established between the line of substation T and the line of called substation T. 7

Upon the removal of the receiver at the calling substation a circuit may be traced from ground Gr. through springs 17 and 18,

to and tl'irough substation T, springs 19 and 20 and the relay 6 to battery B. The relay 6, upon energizlng, places ground from G upon the bush of all the multiple jacks asso-' ciated with the line of substation T, and in I addition closes a circuit from ground G through springs 21 and 22, lamp 8, springs 23 and 24to battery B. a

The operator upon seeing the lamp 8 glowing, knows that aconneetion is desired and thereupon inserts the plug P into the jack 9. A circuit may now be traced from ground G through relay 25, sleeve of plug .P and bush of jack 9, relay'7, relay 10 to battery B. The relays 25, 7 and 10 energize over the above circuit, the relay 7, upon energizing, removes the linerelay 6 from v the line and extends the connection to the cord circuit The relay 10, upon energizing, removes ground G from the circuit oil The relay 25, upon energizing,

lamp 8. closes the circuit of lamp 123 at'the springs 25", but this is without effect as the said circalling line,.and converses'with the calling subscriber.

Upon learning the number of the called subscriber the A-operator depresses the-order wire key K, and repeats the number to the B-operator, the B-operator then assigns the trunk to be used.

line relay 32'fron1 the called line.

I The B-operator upon receiving an order, raises the plug P associated with the trunk she has assigned to the A-operator, from its plug switch seat 16 and touches the bush of the ack of the called line with the tip or" the said plug. 7 If the line is idle, the B-operator then inserts the plug P into the jack M and in so doing closes a circuit from ground G through relay 30, sleeve oi plug 2 and bush'of ac M,springs 31, the two *wlndlngs of relay 11 in series to battery B.

The relay 11, upon energizing, removes the The re lay 30, upon energizing completes the talking circuit through the cord circuit I. Upon the removal of the plug P from the plug seat switch 16, a circuitmay be traced from ground G through springs 16, relay to battery B. The relay 35, upon energizing, closes a circuit through the lamp 155 which is without effect at this time, since the said lamp will immediately be extinguished as hereinafter explained I The A-operator, upon being assigned a trunk, inserts the plug P into the jack 33, associated with the assigned trunk A circuit may now be traced from ground G through resistance 36, busho'f jack 33 and sleeve of plug P, relay 37 to-battery B. The I relay 37, upon energizing,,closes a circuitfrom ground G through springs 38', lamp 14, springs 39 to battery B. The glowing of lamp 14 informs the A-ope'rator that the called party has not answered. 'As further a result of the insertion of the plug P" into 7 the jack 33, another circuit may be traced from ground G through winding 34 of repeating coil R, tip of plug P," and of jack 33 conductor 90, resistance 40, relay 41, conductor 91, ring of jack 33and of plrw P, relay 12, winding 42 of repeating coil .\1 to battery B. The. resistance 40 is high enough that relay 12 will not operatively energize over the above circuit, the relay 41, however, energizes and opens the circuit oi the lamp 15 at the springs 43.

Returning to the operation of the B-operators cord circuit Fig. 2 it will be seen that upon the energization of the relay 30 a circuit is closed from ground G throughrinterrupter 44, springs 45, springs 46, and 7 ringer relay 47 to battery B. The ringer relay 47 energizes intermittently due to the interrupter 44 and operates to disconnect the called line from. the cord circuit and bridge the ringing current generatorR in series with battery B across the called line. The circuit may be traced from ground G through springs 48 and 48?, springs 49 and .50, tip of plug P and of jack M, springs 51 and 52, through ringer and CO1'.1(le11SeI'.- at substation T, springs 53 and 54, ring of jack M and of plug P springs 55' and'ob, upper winding of relay 57, generator R, and through battery B to ground G. The ringer at substation T will be energized by the ringing current, but the relay 57 is so adjusted that it will not respond to the said 11 ringing current. Upon the response of the called subscriber a path for direct current will be formed at the substation T whereupon the relay 57 will become energized.

The relay 57, uponenergizing, opens the cir cuit of the ringer relay at the springs 45, in

addition forms a locking circuit, for itself 1 I from ground G through the lower winding of relay 57, springs 58, springs 59-to battery B. Upon the deenergization of ringer relay 47 battery and ground are supplied to the called line through the relay 60 and 61. The relay 60, upon energizing, shunts the resistance 40 at the springs 62, this increases the fiow of current in the trunk'to such an extent that the relay 12 becomes energized and The relay 11, upon deenergizing, closes a circuit from ground G through springs 27, springs 25 and lamp 13 to battery B, thus causing said lamp 13 to glow; The restoring of the receiver at the called substation opens the circuit of the relay 60, which, upon deenergization, removes the shunt from around the resistance 40. This added resistance in the trunk causes the relay 12 to release its armtature thus again closing the circuit of the lamp 14. The A- ,operator, upon seeing both the lamp 13 and the lamp 1 1 lighted knows that a'disconnect is desired and forthwith removes theplugs P and P from their respective jacks. The removal of the plug P from the jack 33 opens the circuit of relay 41, which, upon deenergizing, closes a circuit from ground G through springs 13, lamp 15, springs 59 to battery B. The glowing of the lamp 15 informs the B-operator that theA-operator has taken down the connection, whereupon the B 1\r/ilperator removes the plug P from the jack The restoring of the plug P to the plug seat switch 16 opens the circuit of the relay 35. The relay 85 upon de'energizm relay 57.

It having been explained how a connection can be established between a calling and a called subscriber and how the same is released, it will now be explained how a connection is prevented from being made with a busy line and how the connection isthen taken down and the calling subscriber given the busy signal from his answering jack equipment. If the called line should. be busy, therewill be a ground potential upon. the bush of all the multiple acks associated with that line. 'VVhen the "B-operator touches the tip of the plug P to the bush of a busy multiple jack, a circuit will be formed from ground potential at the multiple jack through tip of plugP springs 50 and 63 and tertiary winding 64 of induction coil to battery B. This flow of current will cause a click in the B=operator-s receiver which'will inform her that the called numher is busy, whereupon she returns the plug P to its plug seatswitch 16, thus opening the circuit of the relay The relay 35, upon de'e'nergizing, closes a circuit from ground G 4 through interrupter 65, springs 66. springs 67, relay 68 to'battery B. The relay 68 energizes intermittently, due to the interrupter 65 and operates to periodically shunt the resistance 10 at the springs 69.

opens the circuit to the lower'winding ofthis comprises,-of course, the relay The shunting of the resistance 40 causes the lamp 14 to be intermittently extinguished thus informing the Aoperator that the called number is busy. The A-operator then removes the plugs P and P from their respective jacks. The removal of the plug P from thejack 9 opens the circuit of the cut-off relay 7, which, upon deenergizing, closes a circuit from ground G, through 'spr1ngs17 and 18, to and through substation T, springs 19 and 20 and relay 6 to battery B. The relay 6, upon e1 1ergizing,.closes a circuit from ground G through springs 70 and 71, springs 72, relay 10 to battery B. The relay 10, being slowacting, did not deenergize immediately uponthe withdrawal of'the plug P, but remained energized long enough for the above traced-circuit to be formed, after which it of course locks up.

Another circuit is now formed from ground G through interrupter 78," secondary of busy machinejQ', springs 74, springs 7 5 to and through the substation T, springsfi18 and 17 to ground G. The calling subscriber upon hearing the busy tone will know that the called number is busy and will then return his receiver to the receiver hook, thereby causing the de'elnergization of line relay 6, which in turn allows the relay 10tto denergize. It will be seen that 'as long as the calling subscriber is receiving the busy tone there will be a guarding potential from ground G upon all of the multiple jacks associated with thatline.

It will be seen therefore that we have provided an improved arrangement whereby as soon as a subsoribersline relay energizes a guarding potential is applied to the multiple jacks M so as to make the calling line busy even before the operatoranswers, We have also provided an improved arrangement whereby the line relay of the subscriber controls the signal'for the operator and also controls a signal for the subscriber to indlcate to him that he should hang up his receiver and call again. VVe alsoprovide means whereby the B operator through the medium of a plug seat comprising the plug 16 is enabled to give the A operator automatically a busy 'flash signal'by varying :the resistance on the line between the two "cords.

68 and the interrupting ma chinei65.

Therefore; it will be seen that wezhave batter a source of 'si nalin currentcom- The .means for "accomplishing mon to said system, a signaling'circuit individual to said line, manual. means for connecting said trunk and line, means for closing said battery circuit to energize said cut-off relay and said auxiliary relay when the said connection is made, the said aux iliary relay operating when energized to connectthe said source of signaling current with said individual circuit, an energizing circuit for said line relay controlled by said cut-off relay, and means for breaking the energizing circuit of the said auxiliary relay and of the cut-ofi relay when the line and-trunk are disconnected, the cut-off relay operating upon deenergizing to close the circuit of the line relay for energizing the same to connectthe said signaling current via said individual signaling circuit with said line for signaling the line, said line relay operating also to close the locking cirouit of'said auxiliary relay before the auxiliaryrelay has time to deenergize.

2. In a telephone system, a subscribers line, a cord circuit connected with said line, a busy signaling device andmeans for automatically sending .a busy signal over the line when the cord is withdrawn from the line until cut oil by the subscriber, and automatic means responsive to the cutting off by the subscriber to remove the signal from the control of-the subscriber.

3. In a telephone system, a subscribers line, a cord circuit connected with said line,

' a busy signaling device and means individ- 'ual to the line for automatically sending a busy signal over the line when the cord is Withdrawn from' the line until cut off by the subscriber, 5 and automatic means responsive to the cutting off by the subscriber to remove the signal from the subscribers control.

' 4. In a telephone system, a manual subscribers line and a trunk connected in circuit, means for separating the two, and means responsive when the connection is broken for applying asignal .to the line until cutoff by the subscriber, and automatic ,means responsive to the cutting off by the subscriber to remove the signal from the subscribers control. 1 g 7.5. In a telephone system, a subscribers line and a trunk connected in circuit, manthe subscriber, and automatic means responsive to the cutting ofi by the subscriber to remove the signal from the subscribers control.

7. In a telephone system, a subscribefls line and a cord connected in circuit, a line relay, manual means for separating the cord and circuit, and'automaticmeans comprising said relay responsive when the connection is broken for applying a signal to the line until cut off by the subscriber, and automatic means responsive to the cutting off by the subscriber to remove the signal from the subscribers control.

8. In a telephone system, a line,a trunk, a line relay, an auxiliary relay, a source of signaling current common to said system, a signaling circuitindividual to said line, means for connecting said trunk and line, said auxiliary relay responsive when the connection is made for connecting said source of signaling current with said indifor signaling the line.

9. In a telephone system, a line, a trunk, a line relay, an auxiliary relay, a source of signaling current common to said system, a signaling circuit individual, to said line, manual means for connecting said trunk, and line, said auxiliary relay responsive when the connection is made for connecting said source of signaling current with said individual signaling circuit, said line relay responsive when the connection is broken for automatically connecting said signaling current via said individual signaling circuit with said line for signaling the line.

- 10. In a telephone system, a line, a trunk, a line relay, a slow acting auxiliary relay, a

vsource of signaling current common to said system, a signaling circuit individual to said line, manual means for connecting v said trunk and line, saidauxiliary relay responsive when the connection is made for connecting said source of signaling current with said individual signaling circuit, said line relay responsive when the connection is broken for automatically connecting said signaling current via said individual signaling circuit with said line for signaling the line.

11. In a telephone system, a line, a trunk, a linerelay, an auxiliary relay, a source of signaling current common to said system, a signaling circuit individual .to said line, means for connecting'said trunk and line, said auxiliary relay responsive when the connection is vmade for connecting said source of signaling current with said individual signaling circuit,said line relay responsive when the connection is broken for connecting said signaling currentvia said line relay.

12. In a telephone system, a line, a trunk, a line relay, an auxiliary relay, a source of signaling current common to said system, a signaling circuit individual to said line,

manual means for connecting said trunk and line, saidauxiliary relay responsive when the connection is made for connecting said source of signaling current with said individual signaling circuit, said line relay responsive when the connection is broken for automatically connecting said signaling current via said individual signaling circuit with said line for signaling the line, and a locking circuit forsaid auxiliary relay controlled by said line relay.

13. In a telephone system, a line, a trunk,

a line relay, a slow acting auxiliary relay,

a source of signaling current common to said system, a signaling circuit individual to said line, manual means for connecting said trunk and line, said auxiliary relay responsive when the connection is made for connecting said source of signaling current with said individualsignaling circuit, said line relay responsive when the connection is broken for automatically connecting said signaling current via said individual signaling circuit with said line for signaling the line, and a locking circuit for said auxiliary relay controlled by said line relay.

14. In a telephone system, a line, a line relay, a cut-ofi' relay, an auxiliary relay, a trunk, a locking circuit for said auxiliary relay, means for energizingsaid auxiliary relay and said cut-ofi' relay comprising a battery, a source of signaling current common to said system, a signaling circuit individual to said line, means for connecting said trunk and line,'means for closing said battery circuit to energize said cut oil' relay and said auxiliary relay when the said connection is made, the said auxiliary relay operating when energized to connect the said source of signaling current with said individual signaling circuit, an energizing circuit for saidline relay controlled bysaid cut-01f relay, and means for breaking the energizing circuit of the said auxiliary relay and of the cut-off relay when said line and trunk are disconnected, the cut 05 relay operating upon denergizing to close the circuit of the line relay for energizing the same to connect the said signaling current via said individual signaling circuit with said line for signaling the line, said line relay operating also to close the locking circuit of said auxiliary relay before the auxiliary relay has time to denergize.

15. In a telephone system, a subscribers line, a line relay, a signal for said line, means comprising said relay operable over said line for bringing said signal into operation, a cord, means controlled from said cord for retiring said signal, another signal, means comprising said relay controlled from said cord for applying said last signal to said line, and means for preventing the subscriber from applying said second signal to the line.

16'. In a telephone system, a subscribers line, a ack for said line normally disconnected therefrom, a cut-off relay for said line, a cord, a plug and an energizing circuit for said cut-off relay, means for closing said circuit when said plug is inserted in said jack and for energizing said cut-ofi relay,

and means controlled by the energization of said relay for connecting said line and said jack to extend a connection from the line.

to the cord, and means controlled by said cut-off relay for applyinga signal to said line, and for preventing the subscriber from applying said signal tohis line.

Signed by me at Chicago, Cook county,

Illinois, this 12th day of July 1917.

GEORGE A. Y NooHowsKi.

Signed by me at 'St. Paul, Ramsey county,

16th da of July, 1917.

Minnesota, this HARR E. HERSHEY. 

